Derived by adaptation of primary cell culture product ATCC VR-647 to MDCK cells (ATCC CCL-34). ATCC VR-647 and ATCC VR-1785 have not been compared for sequence or infectivity in primary cell culture and tissue culture. Chloroform/ether sensitive, not known to hemagglutinate, sensitive to pH below 6.5 and heat labile.

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